US20090014527A1 - Ask-026 - Google Patents
Ask-026 Download PDFInfo
- Publication number
- US20090014527A1 US20090014527A1 US12/138,796 US13879608A US2009014527A1 US 20090014527 A1 US20090014527 A1 US 20090014527A1 US 13879608 A US13879608 A US 13879608A US 2009014527 A1 US2009014527 A1 US 2009014527A1
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- US
- United States
- Prior art keywords
- chip
- contacts
- antenna
- conductive
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 claims abstract description 40
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 239000003989 dielectric material Substances 0.000 claims abstract description 7
- 230000006978 adaptation Effects 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 239000002657 fibrous material Substances 0.000 claims 2
- 238000009434 installation Methods 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
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- 238000001465 metallisation Methods 0.000 description 4
- 244000045947 parasite Species 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000000151 deposition Methods 0.000 description 1
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- 239000012212 insulator Substances 0.000 description 1
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- 238000013508 migration Methods 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Definitions
- This invention concerns the means of connecting integrated circuits to electric circuits and concerns particularly a method for connecting an electronic chip to a radiofrequency identification device.
- the integrated circuits or very small electronic chips are widely used in many areas including smart cards, radiofrequency identification labels and cards commonly referred to as the RFID field.
- the integrated circuits In order to be connected to electric circuits, the integrated circuits have several means of contact capable of being connected to the group of contacts of the circuit, their number varying according to the application. In the RFID field, the number of contacts of the integrated circuit varies generally between 2, 3 and 4.
- the manufacturing process of a semi-conductor is based on the use of a complex photographic method to create the mask of each layer. Depending on the complexity of the integrated circuit, there can be up to 20 to 30 layers. Metallization levels, used to lay down aluminum or copper, are placed on the last layers. The last metallization level located on the periphery of the integrated circuit on the last layer making up the chip is created during the last manufacturing steps of the integrated circuit and features conductive plates. These conductive plates will then be used to receive the means of contact that will be used to connect the integrated circuit to its destination electric circuit. The last manufacturing step of the integrated circuit is the creation of a passivating layer on the face of the integrated circuit where the conductive plates are flush. This passivating layer consists of a layer of insulating material of constant thickness of a few microns and featuring openings located opposite the conductive plates so as to enable ohmic contact of almost zero electrical resistance with the connection means.
- wire bonding One of the techniques used to make the electrical connections between the electronic chip and the circuit in which it is inserted consists in using wire bonding.
- the wiring is simply done by wires (or bonds) 14 welded between the two contacts designed to this end on each of the elements to be connected together.
- the aluminum, gold or copper wires are generally welded by ultrasonic welding.
- the diameter of the wire is in the order of 25 ⁇ m (micrometers).
- the chip 10 is generally encased in a box 16 , active face up.
- the wires are wired on conductive plates 12 flush with the active face of the chip 10 .
- the second end of wires is connected to stiff connecting tabs 18 integral with box 16 and designed to be welded to the destination circuit.
- the means of contact between the chip and the contacts of the destination circuit include wire conductive contacts between the conductive plates located on the last metallization level of the chip and the stiff tabs 18 of the box 16 on the one hand, and welds between the stiff tabs 18 and contacts of the destination circuit on the other hand.
- This means of contact has the advantage of providing large sizes with respect to the chip owing to tabs 18 and the box 16 .
- the box 16 generally made of plastic material, provides significant additional thermal inertia and enables to limit temperature variations of the chip. The drawback of such an installation resides in the fact that it is expensive. Furthermore, its thickness is large because of the connecting wires, box and tabs.
- the size of such an installation makes it unsuitable for smart cards, radiofrequency identification labels and cards that have a thickness of less than 1 mm.
- the size of wires requires high precision during installation, in the order of a few tens of micrometers.
- a second way to install integrated circuits or electronic chips is based on another assembly technique in which the chip is turned over, this is the “Flip Chip” technique.
- This technique is characterized by a direct connection of the chip's active face on the destination electric circuit, unlike the “Wire Bonding” type wiring technique and is shown in cross-section in FIG. 2 .
- This technique consists in placing a ball of conductive material 20 commonly referred to as “bump”, usually made of gold, on each of the conductive plates 12 of the chip 10 in the openings of an electrically insulating layer 34 that represents the passivating layer located on the active face of the chip.
- the chip is then connected by its active face to the destination electric circuit 22 through the contact of balls of conductive material on the group of contacts 24 of the electric circuit; the group of contacts being placed so as to reproduce the location of balls of conductive material.
- the means of contact between the chip and the contacts of the destination circuit consists of a ball of conductive material in contact between the two parts.
- the disadvantage of such an installation resides in the accuracy of positioning, the size of balls of conductive material and that of conductive plates being in the order of 100 ⁇ m, this makes the installation tricky.
- the step that consists in placing balls of conductive material represents a significant cost in the fabrication process of integrated circuits or electronic chips.
- the object of the invention is to provide a method for installing the chip on an electric circuit that do not require means of contact added to the chip to create the connection between the chip and the electric circuit.
- the object of the invention is thus a method for connecting an electronic chip to contacts of an electric circuit designed to receive the chip, the chip being provided with two conductive plates located on the last layer making up the chip and at least one electromagnetic shielding layer, at least one of the plates being entirely covered by an electrically insulating layer, the method including the following steps:
- FIG. 1 represents an installation technique for chips using conductive wires
- FIG. 2 represents an installation technique for chips using “bumps”,
- FIG. 3 represents a cross sectional view of the chip according to the invention
- FIG. 4 represents a cross sectional view of the electric circuit support after depositing the dielectric material
- FIG. 5 represents a cross sectional view of the electric circuit support after the chip positioning step
- FIG. 6 represents a contactless portable object seen from top to which is connected a chip according to the invention.
- the chip or the integrated circuit 10 features two metal plates 31 and 32 corresponding to metallization made at the last level of the chip.
- these metal plates represent the groups of contacts to which the means of contact are connected in order to create an ohmic link between the chip and the electrical circuit on which it is installed.
- at least one of the metal plates is of a size larger than those used for connecting integrated circuits by traditional methods, thus by ohmic contact.
- the preferred embodiment of the invention describes two identical metal plates designed to create two connections according to the invention.
- the size of each metal plate is in the order of 200 ⁇ m ⁇ 500 ⁇ m.
- the electrically insulating passivating layer that is created last on the active face of the chip, i.e. the face featuring the metal plates, does not include any opening unlike the electronic chips adapted to be connected by ohmic type means of contact.
- the electrically insulating layer 34 is made on the entire active surface of the chip to form an insulating layer of uniform thickness generally less than 3 ⁇ m.
- the support 46 on which the chip is connected is shown in cross-section. It may be a support of flexible material such as a paper support on which is printed an antenna by screen printing, flexography, rotogravure, offset or ink jet. Or else, it may be any electrical circuit such as an electronic card, for example.
- the antenna represented by the two trace parts 67 and 68 features two contacts 47 and 48 also made in the same way as the antenna and extending from the latter in order to connect the chip and the antenna.
- the conductive ink used is preferably a polymer ink loaded with conductive elements such as silver, copper and carbon.
- An adhesive dielectric material 40 is placed on the support 46 , between the two contacts 47 and 48 . This adhesive material is applied before the chip is placed on the support.
- the chip is positioned on the support 46 so that the metal plates 31 and 32 of the chip are opposite the contacts 47 and 48 of the antenna. It does not matter whether the ink forming the contacts 47 and 48 is dry or wet.
- a pressure is exerted on the chip. As a result of the pressure, the adhesive dielectric material 40 spreads and covers the entire surface of the chip between the contacts 47 and 48 . It thus enables to hold the assembly of the chip 10 on the support 46 and particularly to maintain the chip 10 in a fixed position on the support.
- a capacitive link is thus created between the metal plate 31 and the contact 47 .
- a capacitive link is thus created between the metal plate 32 and the contact 48 .
- the value of the capacitance obtained is proportional to the surface area of the plates facing one another and to the value of the permittivity of the insulating layer that separates them and inversely proportional to the thickness of this insulating layer.
- the common relative permittivity value is in the order of 4 for materials used in the manufacture of chips. In general, the thickness of the electrically insulating layer is in the order of 3 ⁇ m.
- FIG. 6 shows a front view of a contactless portable object 60 such as a smart card or a ticket.
- the antenna 62 features conductive traces 67 and 68 ending by two connection pads, similar to two contacts 47 and 48 described previously.
- the chip 10 is connected to the antenna according to the method of the invention.
- connection formed by a metal plate, an insulating layer and a contact forms a capacitor.
- a capacitor or a capacitance being made up of two conductive plates separated by an electrical insulator
- the capacitive link represented by the connection made according to the invention method is constituted for one of the conductive plates by a contact or conductive plates 31 or 32 within the electronic chip itself 10 , for the insulator by the electrically insulating layer or passivating layer of the electronic chip and for the second conductive plate by contacts 47 and 48 of the electric circuit and designed to receive the chip.
- the value of the capacitance required will depend on the impedance of the circuit to be connected at the desired operating frequency, in order to create the optimum impedance of the chip for its adaptation (commonly referred to as “matching network”) to the impedance of the antenna.
- the purpose of the invention is preferably suited to frequency ranges from Ultra High Frequencies (UHF) in the order of one GHz and particularly greater than 860 MHz (frequency of 1 GHz according to the ISO 18000-6 standard and frequency of 2.45 GHz according to the ISO 18000-4 standard).
- UHF Ultra High Frequencies
- the chip When the chip is built into an electric circuit and the signals exchanged between the chip and the circuit are high frequency signals, it is always necessary to create an element or an adaptation network added at the output of the chip or otherwise.
- This adaptation enables to optimize the transfer of power of the signal exchanged or to optimize the performance in terms of noise i.e. to reduce random and unwanted signals overlapping the useful signals.
- the adaptation is done by means of a network of components such as capacitance or inductance.
- the device according to the invention enables to add to the RC model of the chip a capacitance in series that plays the role of the adaptation element so as to enable optimum adaptation between the chip and the electrical network to which it is connected.
- the network connected to the chip is an antenna.
- the value of the capacitance of the capacitive link created between the chip and the antenna as defined by the invention is taken into account in the adaptation of the antenna to the chip and thus enables to optimize this adaptation.
- the required surface area is in the order of 6.8 10 ⁇ 6 m2, which corresponds, for example, to a surface area of 200 ⁇ m ⁇ 340 ⁇ m.
- conductive plates will have to be provided with a surface area of at least 200 ⁇ m ⁇ 340 ⁇ m.
- conductive plates of surface area less than 200 ⁇ m ⁇ 340 ⁇ m may be provided for.
- the capacitive link made according to the method of the invention thus contributes to the adjustment of the adaptation of the chip and the circuit where it is inserted, thus in our case the adjustment of the adaptation of the chip to the antenna and even represents an essential element of the adaptation network.
- the capacitive link then created between the chip and the antenna and as defined by the invention is also taken into account in the tuning of the antenna to the chip. Actually, the antenna must be tuned to the operating frequency of the reader.
- the method according to the invention has the advantage of making the installation of the chip on contacts of the destination circuit easier.
- the size of metal plates being very big compared to the size of the chip, the accuracy of the installation according to the method of the invention is much lower than that required for the installation of chips according to the “flip chip” type assembly technique as described previously and in which the connection is made by means of chip bumps having a diameter less than 100 ⁇ m.
- the positioning of the chip will be possible just by identifying the large side and the small side of the chip's active face.
- the rectangular shape of the active face and the symmetrical layout of conductive plates enable to do away with the orientation of the chip along the larger side as both orientations are possible. Furthermore, owing to the large size of conductive plates, this enables to increase the tolerances when installing the chip. In this manner, the time saved on the identification phase of the chip bumps and the widening of installation tolerances enables to increase the work rate for the installation of chips on circuits designed to receive them and thus to reduce production costs.
- the metal plates are protected against pollution, diffusion, migration and other electrical phenomena likely to affect the quality and functionality of the electronic chip.
- the production of the chip or integrated circuit is based on the use of a complex photographic method to create the various layers containing all of the circuits.
- the various layers making up the chip 10 are manufactured in such a way that the part within the thickness of the chip located opposite the conductive plates 31 and 32 situated at the periphery of the chip contains as few metal connections as possible to form the integrated circuit. By placing the chip horizontal, this part corresponds to the part of the chip situated above the conductive plates 31 and 32 .
- the chip can also contain, on one or more levels, one or more additional metal layers in order to minimize the parasite capacitance between the plates 31 and 32 of the capacitor and all metal connections directly opposite.
- This (or these) layer(s) play(s) the role of a shield or electromagnetic screen against radiation emitted by the chip connections that, on the scale of the chip, create parasite capacitance harmful to the capacitive link created between the conductive plates 31 and 32 and contacts 47 and 48 .
- the presence of such a parasite capacitance tends to reduce the capacitance value of the capacitive link created between the chip and the antenna and could also reduce it to the point of making the electrical connection between the chip and the antenna insufficient.
- This (or these) additional electromagnetic shielding layer(s) is therefore very important.
- This shielding is therefore preferably located between the conductive plates and the chip connections so as to reduce as much as possible the parasite capacitance that could appear between the conductive plates and the chip connections and to optimize the capacitance value of the capacitive link.
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Abstract
-
- Placing an adhesive dielectric material (40) on the circuit between the contacts (47, 48), so as to maintain the electronic chip (10) in a fixed position relative to the circuit,
- Positioning the electronic chip (10) on the circuit so that the conductive plates (31 et 32) are opposite the contacts (47 and 48) of the electric circuit, so as to create between the chip and the electric circuit at least one capacitive link made up of the conductive plate (31 or 32), the electrically insulating layer completely covering said plate and the contact (47 or 48).
Description
- This invention concerns the means of connecting integrated circuits to electric circuits and concerns particularly a method for connecting an electronic chip to a radiofrequency identification device.
- In the field of semi-conductors, the integrated circuits or very small electronic chips are widely used in many areas including smart cards, radiofrequency identification labels and cards commonly referred to as the RFID field. In order to be connected to electric circuits, the integrated circuits have several means of contact capable of being connected to the group of contacts of the circuit, their number varying according to the application. In the RFID field, the number of contacts of the integrated circuit varies generally between 2, 3 and 4.
- The manufacturing process of a semi-conductor is based on the use of a complex photographic method to create the mask of each layer. Depending on the complexity of the integrated circuit, there can be up to 20 to 30 layers. Metallization levels, used to lay down aluminum or copper, are placed on the last layers. The last metallization level located on the periphery of the integrated circuit on the last layer making up the chip is created during the last manufacturing steps of the integrated circuit and features conductive plates. These conductive plates will then be used to receive the means of contact that will be used to connect the integrated circuit to its destination electric circuit. The last manufacturing step of the integrated circuit is the creation of a passivating layer on the face of the integrated circuit where the conductive plates are flush. This passivating layer consists of a layer of insulating material of constant thickness of a few microns and featuring openings located opposite the conductive plates so as to enable ohmic contact of almost zero electrical resistance with the connection means.
- One of the techniques used to make the electrical connections between the electronic chip and the circuit in which it is inserted consists in using wire bonding. With reference to
FIG. 1 , the wiring is simply done by wires (or bonds) 14 welded between the two contacts designed to this end on each of the elements to be connected together. The aluminum, gold or copper wires are generally welded by ultrasonic welding. The diameter of the wire is in the order of 25 μm (micrometers). In order to protect the wires, thechip 10 is generally encased in abox 16, active face up. The wires are wired onconductive plates 12 flush with the active face of thechip 10. The second end of wires is connected to stiff connectingtabs 18 integral withbox 16 and designed to be welded to the destination circuit. In this manner, the means of contact between the chip and the contacts of the destination circuit include wire conductive contacts between the conductive plates located on the last metallization level of the chip and thestiff tabs 18 of thebox 16 on the one hand, and welds between thestiff tabs 18 and contacts of the destination circuit on the other hand. This means of contact has the advantage of providing large sizes with respect to the chip owing totabs 18 and thebox 16. Thebox 16, generally made of plastic material, provides significant additional thermal inertia and enables to limit temperature variations of the chip. The drawback of such an installation resides in the fact that it is expensive. Furthermore, its thickness is large because of the connecting wires, box and tabs. In this manner, the size of such an installation makes it unsuitable for smart cards, radiofrequency identification labels and cards that have a thickness of less than 1 mm. Finally, the size of wires requires high precision during installation, in the order of a few tens of micrometers. - A second way to install integrated circuits or electronic chips is based on another assembly technique in which the chip is turned over, this is the “Flip Chip” technique. This technique is characterized by a direct connection of the chip's active face on the destination electric circuit, unlike the “Wire Bonding” type wiring technique and is shown in cross-section in
FIG. 2 . This technique consists in placing a ball ofconductive material 20 commonly referred to as “bump”, usually made of gold, on each of theconductive plates 12 of thechip 10 in the openings of an electrically insulatinglayer 34 that represents the passivating layer located on the active face of the chip. The chip is then connected by its active face to the destinationelectric circuit 22 through the contact of balls of conductive material on the group ofcontacts 24 of the electric circuit; the group of contacts being placed so as to reproduce the location of balls of conductive material. For such an installation technique, the means of contact between the chip and the contacts of the destination circuit consists of a ball of conductive material in contact between the two parts. The disadvantage of such an installation resides in the accuracy of positioning, the size of balls of conductive material and that of conductive plates being in the order of 100 μm, this makes the installation tricky. Furthermore, the step that consists in placing balls of conductive material represents a significant cost in the fabrication process of integrated circuits or electronic chips. - The two traditional installation techniques used for the connection of electronic chips and described previously consist thus in creating an ohmic link and require the addition of conductive material for the contact between the chip and the electric circuit on which it is inserted.
- This is why the object of the invention is to provide a method for installing the chip on an electric circuit that do not require means of contact added to the chip to create the connection between the chip and the electric circuit.
- The object of the invention is thus a method for connecting an electronic chip to contacts of an electric circuit designed to receive the chip, the chip being provided with two conductive plates located on the last layer making up the chip and at least one electromagnetic shielding layer, at least one of the plates being entirely covered by an electrically insulating layer, the method including the following steps:
-
- Placing adhesive dielectric material on the circuit between the contacts, so as to maintain the electronic chip in a fixed position relative to the circuit,
- Positioning the electronic chip on the circuit so that the conductive plates are opposite the contacts of the electric circuit, so as to create between the chip and the electric circuit at least one capacitive link made up of the conductive plate, the electrically insulating layer completely covering the plate and the contact.
- The purposes, objects and characteristics of the invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which:
-
FIG. 1 represents an installation technique for chips using conductive wires, -
FIG. 2 represents an installation technique for chips using “bumps”, -
FIG. 3 represents a cross sectional view of the chip according to the invention, -
FIG. 4 represents a cross sectional view of the electric circuit support after depositing the dielectric material, -
FIG. 5 represents a cross sectional view of the electric circuit support after the chip positioning step, -
FIG. 6 represents a contactless portable object seen from top to which is connected a chip according to the invention. - According to
FIG. 3 , which represents a cross-section, the chip or the integratedcircuit 10 features twometal plates layer 34 is made on the entire active surface of the chip to form an insulating layer of uniform thickness generally less than 3 μm. - According to
FIG. 4 , thesupport 46 on which the chip is connected is shown in cross-section. It may be a support of flexible material such as a paper support on which is printed an antenna by screen printing, flexography, rotogravure, offset or ink jet. Or else, it may be any electrical circuit such as an electronic card, for example. The antenna represented by the twotrace parts contacts dielectric material 40 is placed on thesupport 46, between the twocontacts - Once the adhesive material is applied, the chip is positioned on the
support 46 so that themetal plates contacts contacts dielectric material 40 spreads and covers the entire surface of the chip between thecontacts chip 10 on thesupport 46 and particularly to maintain thechip 10 in a fixed position on the support. A capacitive link is thus created between themetal plate 31 and thecontact 47. Similarly, a capacitive link is thus created between themetal plate 32 and thecontact 48. The value of the capacitance obtained is proportional to the surface area of the plates facing one another and to the value of the permittivity of the insulating layer that separates them and inversely proportional to the thickness of this insulating layer. Permittivity is expressed in Farads per meter (F/m). It can also be expressed by a dimensionless quantity: the relative permittivity or dielectric constant, standardized with respect to the permittivity of vacuum ∈0 (Epsilon0)=8.854187×10−12 F/m. The permittivity of the material is then equal to ∈=∈0*∈R (Epsilon=Epsilon0*Epsilon R) Whatever the thickness of the electrically insulating layer known as the passivating layer, the common relative permittivity value is in the order of 4 for materials used in the manufacture of chips. In general, the thickness of the electrically insulating layer is in the order of 3 μm. -
FIG. 6 shows a front view of a contactlessportable object 60 such as a smart card or a ticket. Theantenna 62 features conductive traces 67 and 68 ending by two connection pads, similar to twocontacts chip 10 is connected to the antenna according to the method of the invention. - Each connection formed by a metal plate, an insulating layer and a contact forms a capacitor. As a result, a capacitor or a capacitance being made up of two conductive plates separated by an electrical insulator, the capacitive link represented by the connection made according to the invention method is constituted for one of the conductive plates by a contact or
conductive plates contacts - The purpose of the invention is preferably suited to frequency ranges from Ultra High Frequencies (UHF) in the order of one GHz and particularly greater than 860 MHz (frequency of 1 GHz according to the ISO 18000-6 standard and frequency of 2.45 GHz according to the ISO 18000-4 standard). Actually, the chips used for such frequencies have a complex input impedance in the order of Z=20−j*100 Ohms, which corresponds for example to an electric circuit containing a resistance and a capacitor in series, thus an RC circuit that has a capacitance value in the order of 800 fF.
- When the chip is built into an electric circuit and the signals exchanged between the chip and the circuit are high frequency signals, it is always necessary to create an element or an adaptation network added at the output of the chip or otherwise. This adaptation enables to optimize the transfer of power of the signal exchanged or to optimize the performance in terms of noise i.e. to reduce random and unwanted signals overlapping the useful signals. The adaptation is done by means of a network of components such as capacitance or inductance. The device according to the invention enables to add to the RC model of the chip a capacitance in series that plays the role of the adaptation element so as to enable optimum adaptation between the chip and the electrical network to which it is connected. In the case of RFID devices, the network connected to the chip is an antenna. The value of the capacitance of the capacitive link created between the chip and the antenna as defined by the invention is taken into account in the adaptation of the antenna to the chip and thus enables to optimize this adaptation.
- Thus, to adapt the input impedance of the chip to the impedance of the circuit and for example for an imaginary portion with input impedance of the chip corresponding to 800 fF (femto Farad), a dielectric of thickness e=3 μm and corresponding to the insulating layer of relative permittivity ∈R (Epsilon R) in the order of 4, we deduce the required surface area of the opposing connecting plates according to the formula C=∈0*∈R*S/e (C=Epsilon 0*Epsilon R*S/e). The required surface area is in the order of 6.8 10−6 m2, which corresponds, for example, to a surface area of 200 μm×340 μm. To implement the invention with RFID chips in the UHF frequency range, i.e. frequencies in the order of giga Hertz, conductive plates will have to be provided with a surface area of at least 200 μm×340 μm. For an imaginary portion of the input impedance of the chip greater than 800 fF, conductive plates of surface area less than 200 μm×340 μm may be provided for. The capacitive link made according to the method of the invention thus contributes to the adjustment of the adaptation of the chip and the circuit where it is inserted, thus in our case the adjustment of the adaptation of the chip to the antenna and even represents an essential element of the adaptation network.
- When dealing with an RFID label type contactless portable object operating at Ultra High Frequencies, the capacitive link then created between the chip and the antenna and as defined by the invention is also taken into account in the tuning of the antenna to the chip. Actually, the antenna must be tuned to the operating frequency of the reader.
- The method according to the invention has the advantage of making the installation of the chip on contacts of the destination circuit easier. Actually, the size of metal plates being very big compared to the size of the chip, the accuracy of the installation according to the method of the invention is much lower than that required for the installation of chips according to the “flip chip” type assembly technique as described previously and in which the connection is made by means of chip bumps having a diameter less than 100 μm. In this manner, with a chip that has a rectangular active face and in which the metal plates are located along the small sides of the rectangle symmetrically with respect to the axis of symmetry parallel to the small sides of the rectangle, the positioning of the chip will be possible just by identifying the large side and the small side of the chip's active face. In this manner, during installation of the chip on the destination electric circuit, the rectangular shape of the active face and the symmetrical layout of conductive plates enable to do away with the orientation of the chip along the larger side as both orientations are possible. Furthermore, owing to the large size of conductive plates, this enables to increase the tolerances when installing the chip. In this manner, the time saved on the identification phase of the chip bumps and the widening of installation tolerances enables to increase the work rate for the installation of chips on circuits designed to receive them and thus to reduce production costs.
- In addition, owing to the fact that the layer of insulating material completely covers the active face of the chip, the metal plates are protected against pollution, diffusion, migration and other electrical phenomena likely to affect the quality and functionality of the electronic chip.
- The production of the chip or integrated circuit is based on the use of a complex photographic method to create the various layers containing all of the circuits. The various layers making up the
chip 10 are manufactured in such a way that the part within the thickness of the chip located opposite theconductive plates conductive plates plates conductive plates contacts
Claims (14)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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FR0704293 | 2007-06-15 | ||
FRFR0704293 | 2007-06-15 | ||
FR0704293A FR2917534B1 (en) | 2007-06-15 | 2007-06-15 | METHOD FOR CONNECTING AN ELECTRONIC CHIP TO A RADIO FREQUENCY IDENTIFICATION DEVICE |
Publications (2)
Publication Number | Publication Date |
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US20090014527A1 true US20090014527A1 (en) | 2009-01-15 |
US7988059B2 US7988059B2 (en) | 2011-08-02 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/138,796 Expired - Fee Related US7988059B2 (en) | 2007-06-15 | 2008-06-13 | Method for connecting an electronic chip to a radiofrequency identification device |
Country Status (4)
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US (1) | US7988059B2 (en) |
FR (1) | FR2917534B1 (en) |
TW (1) | TWI495062B (en) |
WO (1) | WO2009010649A1 (en) |
Cited By (8)
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US20110134170A1 (en) * | 2009-12-09 | 2011-06-09 | Hand Held Products, Inc. | Automatic rfid circuit tuning |
US20110139878A1 (en) * | 2008-02-13 | 2011-06-16 | Yannick Grasset | Contactless object with integrated circuit connected to circuit terminals by capacitive coupliing |
US20110171783A1 (en) * | 2008-09-12 | 2011-07-14 | Yannick Grasset | Method for making contactless portable objects |
EP2458530A1 (en) * | 2010-11-30 | 2012-05-30 | Nxp B.V. | Transponder tagged object and method for its manufacturing |
US20120193804A1 (en) * | 2009-08-06 | 2012-08-02 | Rfideal | Ohmic connection using widened connection zones in a portable electronic object |
US20170300800A1 (en) * | 2013-11-18 | 2017-10-19 | Composecure, Llc | Card with metal layer and an antenna |
CN111192946A (en) * | 2020-01-10 | 2020-05-22 | 深圳市隆利科技股份有限公司 | LED dispensing method |
CN111192948A (en) * | 2020-01-10 | 2020-05-22 | 深圳市隆利科技股份有限公司 | LED dispensing method |
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CN104540317B (en) * | 2007-07-17 | 2018-11-02 | 株式会社村田制作所 | printed wiring substrate |
CN102332413A (en) * | 2010-12-22 | 2012-01-25 | 傅华贵 | Surface mounted technology (SMT) tin paste connecting process |
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US9142485B2 (en) | 2008-02-13 | 2015-09-22 | Yannick Grasset | Contactless object with integrated circuit connected to circuit terminals by capacitive coupling |
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EP2458530A1 (en) * | 2010-11-30 | 2012-05-30 | Nxp B.V. | Transponder tagged object and method for its manufacturing |
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US20170300800A1 (en) * | 2013-11-18 | 2017-10-19 | Composecure, Llc | Card with metal layer and an antenna |
US10089570B2 (en) * | 2013-11-18 | 2018-10-02 | Composecure, Llc | Card with metal layer and an antenna |
CN111192946A (en) * | 2020-01-10 | 2020-05-22 | 深圳市隆利科技股份有限公司 | LED dispensing method |
CN111192948A (en) * | 2020-01-10 | 2020-05-22 | 深圳市隆利科技股份有限公司 | LED dispensing method |
Also Published As
Publication number | Publication date |
---|---|
TW200910556A (en) | 2009-03-01 |
FR2917534A1 (en) | 2008-12-19 |
WO2009010649A1 (en) | 2009-01-22 |
FR2917534B1 (en) | 2009-10-02 |
TWI495062B (en) | 2015-08-01 |
US7988059B2 (en) | 2011-08-02 |
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